class BankAccount {
  double _balance;
 
  BankAccount(this._balance);
 
  void deposit(double amount) {
    if (amount > 0) {
      _balance += amount;
    }
  }
 
  void withdraw(double amount) {
    if (amount > 0 && amount <= _balance) {
      _balance -= amount;
    }
  }
 
  double getBalance() {
    return _balance;
  }
}
 
void main() {
  BankAccount account = BankAccount(1000);
  account.deposit(500);
  account.withdraw(200);
  print('Current balance: ${account.getBalance()}');
}
 

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